At the expense of sounding like a picky naysayer, XMouse never worked
consistently similar to any other X wm's focus-follows-mouse behaviour
that I ever used. And it will never work like Fvwm2 SloppyFocus, which
I've become addicted to. :)
Maybe I was not clear enough with my posting (english is not my native
language, sorry). What I am running is a combination of xmouse for the
native windoze stuff and icewm managing the mouse focus for x11. This is
not always flawless, but with icewm using the "nice" scheme windows and
X11 almost look the same and the context switch between X and windoze
works without having to click or press any weired keys.